Abstract Falling coffee filters are a common object of study in introductory physics laboratory classes. They usually used to demonstrate the terminal velocity, and determine how drag force depends on this velocity. However they can also be other ways that air affects motion falling filter. In particular, qualitatively different fluid acts during initial acceleration from rest, causes much less...

Several studies have recently provided empirical data supporting the view that gravity has been embodied in a quantitative internal model of gravity thereby permitting access to exact time-to-contact (TTC) when intercepting a free falling object. In this review, we discuss theoretical and methodological concerns with the experiments that supposedly support the assumption of a predictive and acc...

Let f be a probability density on an interval I, finite or infinite: I includes its finite endpoints, if any; and f vanishes outside of I. Let X1, . . . ,X k be independent random variables, with common density f The empirical histogram for the X's is often used to estimate f To define this object, choose a reference point xosI and a cell width h. Let Nj be the number of X's falling in the j th...

Destabilized nanobodies can be used to deliver fluorescent proteins and enzymes to specific targets inside cells.

Falling of rigid body through air, water, and sediment with high speed is investigated experimentally and theoretically. Several experiments were conducted to shoot bomb-like rigid bodies with the density ratio similar to MK84 into the hydrographical tank. During the experiments, we carefully observe the position and orientation of the bomb-like rigid bodies. The theoretical work includes the d...

Information about the position and movement of the body with respect to the external environment is vital for normal bodily function. It allows us, for example, to walk and run upright without falling over, and at the same time to maintain steady fixation on an object that may itself be moving. The speed and precision with which the mammalian brain can gather and use this information is evident...

Carrying objects requires coordination of manual action and locomotion. This study investigated spontaneous carrying in 24 walkers who were 13 months old and 26 crawlers who were 13 months old during 1-hr, naturalistic observations in the infants' homes. Carrying was more common in walkers, but crawlers also carried objects. Typically, walkers carried objects in their hands, whereas crawlers mu...

riangulation sensors fall into the general category of noncontact height or range measurement devices. A triangulation sensor may provide the same information as a linear variable differential transformer or contact probe, but without touching the object to be measured. The sensors work by projecting a beam of light onto the object of interest and calculating the distance from a reference point...